re: How Do They Know???

There is no doubt about it. Try this as I did many years ago. It worked then and has worked on every dog since.

While sitting in the easy chair start paying attention to your dog when you get up. If you are headed to the kitchen or outside the dog will rise with you. If you are just getting up to grab a book or go to the restroom the dog might look at you but they know there is no need in them standing up.